.backgrou{
    width: 100%;
    height: 100%;
    background-size: 100%;
    background-attachment: fixed;
    position: absolute;
    left: 0;
    top: 0;
    z-index: -1;
    background-image: url("./1234.JPG");
    /*-webkit-filter: opacity(30%);*/
    filter: 30%;
}

.head{
    margin-top: 0;
    background: #1f2023;
}

.head_font{
    font: 20px/2em "Microsoft YaHei";
    color: rgb(174, 168, 168);
    text-indent: 2em;
}

.table_back{
    position: absolute;
    left: 5%;
    margin: 10px;
    width: 90%;
    height: 800px;
}

.table_sidebar_left{
    position: relative;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);
    width: 30%;
    background-color: #fff;
    text-align: center;
}

.table_sidebar_name{
    position: absolute;
    margin: auto;
    top: 0;
    left: 0;
    right: 0;
    font: 18px/3em "Microsoft YaHei";
    text-align: center;
    width: 97%;
}

.table_sidebar_img{
    display: flex;
    top:55px;
    justify-content: center;
    margin: auto;
    width: 97%;
    text-align: center;
}

.siderbar_q{
    /* text-indent: 3em; */
    font: 700 17px/3em "Microsoft YaHei";
}

.siderbar_qa{
    /* text-indent: 3em; */
    font: 16px/2em "Microsoft YaHei";
}

.i_am_pic{
    clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
    object-fit: cover;
    width: 50%;
}

.table_main{
    width: 60%;
}

.table_column{
    width: 60%;
    height: 70%;
}

.introduce{
    position: relative;
    background: rgba(81, 133, 236, 0.2);
    width: 90%;
    margin: auto;
}

.huanglongjiang{
    text-indent: 2em;
    margin-left: 30px;
    margin-right: 30px;
    padding-bottom: 30px;
}

a{
    display: block;
    background: cadetblue;
    margin-left: 36px;
    width: 250px;
    height: 40px;
    text-indent: 1em;
    text-decoration: none;
    color: #f0f0f0;
}

a:hover{
    color: red;
    background: blue;
}

a:active{
    background: coral;
    width: 400px;
}